Investigation conclusion: the customer's observation was not replicated in-house with retention devices.Retention products were tested with hcg urine at 10miu/ml, 206.7iu/ml, 212.4iu/ml, 225.8iu/ml, as well as hcg serum at 10miu/ml.All of the results were hcg positive at read time and met qc release specification.No false negatives were obtained during in-house testing.Manufacturing batch record review did not uncover any abnormalities.A root cause could not be determined from the information provided by the customer.Based on the information available, there is no indication of a product deficiency.No corrective action is required at this time.
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